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Electrochemical Investigations of Hydrothermally Synthesized Porous Cobalt Oxide (Co 3 O 4 ) Nanorods: Supercapacitor Application
Author(s) -
Jang GwangSu,
Ameen Sadia,
Akhtar Mohammad Shaheer,
Kim Eunbi,
Shin HyungShik
Publication year - 2017
Publication title -
chemistryselect
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.437
H-Index - 34
ISSN - 2365-6549
DOI - 10.1002/slct.201701571
Subject(s) - calcination , materials science , nanorod , supercapacitor , cobalt oxide , cyclic voltammetry , chemical engineering , fourier transform infrared spectroscopy , electrode , specific surface area , electrolyte , electrochemistry , cobalt , nanotechnology , chemistry , catalysis , organic chemistry , engineering , metallurgy
Well‐crystalline porous cobalt oxide (Co 3 O 4 ) nanorods (NRs) were synthesized through hydrothermal method and applied as electro‐active electrode material for pseudo‐supercapacitors. At low calcination temperature of 300 °C, the porous and smooth morphology of Co 3 O 4 NRs were obtained whereas, the rod morphology changed to stacks of nanoparticles at high calcination at 500 °C. The Fourier transform infrared (FTIR) and Raman scattering spectroscopies revealed the formation of pure and good crystal quality porous Co 3 O 4 NRs. Brunauer‐Emmett‐Teller (BET) surface area analysis of porous Co 3 O 4 NRs showed the decrease of surface area and pore volume with the increase of calcination temperature. The charge storage ability, cycle stability and ion transport of the synthesized porous Co 3 O 4 NRs electrode were investigated by performing cyclic voltammetry (CV) in 6 M KOH electrolyte. As compared to Co 3 O 4 NRs‐500 °C electrode, the specific capacitance of ∼226.3 Fg −1 at a scan rate of ∼10 mVs −1 was achieved by the fabricated pseudo‐supercapacitors based on porous Co 3 O 4 NRs‐300 °C electrode. The synthesized porous Co 3 O 4 NRs electrode showed excellent stability by maintaining up to ∼76% capacity retention after 5000 cycles.